Slideshow in DK 5.5 dysfunctional on openSUSE Leap 42.2

[Matthias Albert]

2nd attempt: response to the email list:

I have exactly the same problem as Robert, but I cannot remember the
slide show has ever been working since digikam 5.x.

For me, the slide show is not working with large png files (ca. 100MB
each). For other file types (NEF raw or jpeg files that are smaller) the
slide show works as expected.

I am using digikam 5.5.0 from the Manjaro linux distribution.

Matthias